MORE THAN PASSING FANCY: Alex Klein has a room loaded with memorabilia dedicated to Gang Green.Victor Alcorn

He’s green with insanity.

From signed jerseys to animatronic gridiron action figures, Jets super fan Alex Klein has enough Gang Green gear in his den to fill the Meadowlands.

“There’s nobody who has more stuff than me other than the New York Jets,” said Klein, 44, who’s running out of space in his 180-square- foot green-carpeted “Jets room.”

“I am going to push this wall back into the garage because I need more room,” he said.

When he and very understanding wife Gayle moved into their home in Roslyn Heights, LI, four years ago, Klein, a regional manager for Black Box/Cisco, finally had a place to display the collection he began as a boy — and even installed a surveillance system to protect it.

“I painted the walls Jets green and white, added the Jets green carpet and furnished the room with antique Jets coffee tables and a New York Jets couch,” he said.

His wife drew the line at installing Astroturf.

“That would have been a little much,” she said.

But is her husband crazy?

“No, he’s just a passionate, dedicated fan,” she said, adding diplomatically that “he’s into it more than I am.”

An inflatable Jets linebacker sits on the front lawn protected by security cameras, but it’s the “Jets Room,” his shrine to fandom, that is his favorite place when he isn’t tailgating at the stadium.

There he is surrounded by Joe Namath-signed balls, helmets, tickets and jerseys, a 60-inch plasma television which runs a continuous loop of highlights on nongame days.

Klein became a Jets fan in 1972 when his father was hired as director of public relations at Hofstra University, then the site of the team’s training facility.

A season-ticket holder with eight seats, Klein says he’s so confident the team will dispatch the Pittsburgh Steelers to earn a Super Bowl berth that he’s already bought his tickets to the big game in Texas.

“I’m going to Dallas and the Jets are going to be there,” he said. “I bleed green. I’ve been through the worst of times and now I’m going to enjoy the best of times.”